# Documentation

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# Volume Visualization

Representing gridded volume data as iso, slice, and stream plots

## Functions

 contourslice Draw contours in volume slice planes flow Simple function of three variables isocaps Compute isosurface end-cap geometry isocolors Calculate isosurface and patch colors isonormals Compute normals of isosurface vertices isosurface Extract isosurface data from volume data reducepatch Reduce number of patch faces reducevolume Reduce number of elements in volume data set shrinkfaces Reduce size of patch faces slice Volumetric slice plot smooth3 Smooth 3-D data subvolume Extract subset of volume data set volumebounds Coordinate and color limits for volume data
 coneplot Plot velocity vectors as cones in 3-D vector field curl Compute curl and angular velocity of vector field divergence Compute divergence of vector field interpstreamspeed Interpolate stream-line vertices from flow speed stream2 Compute 2-D streamline data stream3 Compute 3-D streamline data streamline Plot streamlines from 2-D or 3-D vector data streamparticles Plot stream particles streamribbon 3-D stream ribbon plot from vector volume data streamslice Plot streamlines in slice planes streamtube Create 3-D stream tube plot

## Topics

Overview of Volume Visualization

Volume visualization is the creation of graphical representations of data sets that are defined on three-dimensional grids.

Techniques for Visualizing Scalar Volume Data

There are several techniques available for visualizing scalar volume data, such as MRI slices.

Visualizing Vector Volume Data

There are several techniques that are useful for visualizing vector data, such as stream lines, stream particles, stream ribbons, stream tubes, and cone plots.

Exploring Volumes with Slice Planes

A slice plane is a surface that takes on coloring based on the values of the volume data in the region where the slice is positioned.

Connecting Equal Values with Isosurfaces

Isosurfaces are constructed by creating a surface within the volume that has the same value at each vertex. Isosurface plots are similar to contour plots in that they both indicate where values are equal.

Isocaps Add Context to Visualizations

Isocaps are planes that are fitted to the limits of an isosurface to provide a visual context for the isosurface.

Stream Line Plots of Vector Data

This example shows how to use stream lines, slice planes, and contour lines in one graph.

Displaying Curl with Stream Ribbons

Stream ribbons illustrate direction of flow, similar to stream lines, but can also show rotation about the flow axis by twisting the ribbon-shaped flow line.

Displaying Divergence with Stream Tubes

Stream tubes are similar to stream lines, except the tubes have width, providing another dimension that you can use to represent information.

Creating Stream Particle Animations

A stream particle animation is useful for visualizing the flow direction and speed of a vector field. The particles trace the flow along a particular stream line.

Vector Field Displayed with Cone Plots

This example shows how to use cone plots, isosurfaces, lighting, and camera placement to visualize a vector field.

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